Peter Svensson wrote:
On Fri, 12 Aug 2005, Bruce Ferrell wrote:
Hardware, possible. Unlikely to be cabling. It's usually a timing setting.
The blue alarm is really a very specific alarm condition normally. It
cannot quite see how it can be generated accidentally. Something along the
path from the TE110P transmitter to the decoder in the pbx generates a
AIS condition on the line. Theoretically a repeater or converter
withing the pbx could generate the AIS condition on the line.
Another option is that the pbx uses the term "blue alarm" for something
other than the normal AIS signal on a T1.
Disturbances and frame slips would normally generate a local OOF
condition, eventually triggering a local red alarm and sending of yellow
alarm indication to the remote side.
Peter
Well Peter, yo gone and done it... Ya made me go look it up :)
A red alarm means "I don't see any signal". A blue alarm means "I see a
signal and something downstream (repeater etc) is saying they don't see
a signal".
I used this as my reference:
http://www.fratec.com/FAQ/NFO/NFO_WAN_009.HTML
Slips sometimes cause an LOF condition, sometimes they don't. At least
when I worked NorTel DMS250 switches back in the 80's that's the way it was.
Thanks for making me stretch my mind!
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